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Mechanical Operations

Mechanical Operations
Colloid mills achieve size reduction mainly by

Cutting
Impact
Compression
Attrition

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 W.Dr.ρ
3.6 V.W. ρ
3.6 V.W.Dr.ρ
3.6 V.W.Dr/ρ

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Mechanical Operations
Which of the following can be most effectively used for clarification of lube oil and printing ink?

Disc-bowl centrifuge
Precoat filter
Sparkler filter
Sharpies supercentrifuge

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Mechanical Operations
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are

Silicates & phosphates
Bi-carbonates
Sulphates
Carbonates

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Mechanical Operations
The main size reduction operation in ultrafine grinders is

Compression
Impact
Cutting
Attrition

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Mechanical Operations
Size reduction mechanism used in Jaw crushers is

Cutting
Attrition
Compression
Impact

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